Nils alfred tjistger



Fatented en, 22, 1925.

UNIT s1 eena EXPLOSIVE.

N Drawing.

1 '0 all whom it may concern:

Be it known that 1, Nine Annex) UNonn, engineer, a subject of the King of Sweden, residing at l interviken, iispudden, in the llingdo n of Sweden, have i vented certain new and useful Improvements in Explosives; and I do hereby declare the following to be a full, clear. and exact description of the invention, such as will enable others ski led in the art to which it appertains to make and use the same.

This invention relates to a socalled safety explosive. The object of the invention is to produce a powerful explosive of this kind with great rapidity of detonation and which explosive can easily be caused to detonate by means of a percussion cap, but which nevertheless retains all the characteristics of a safety explosive, besides which the explosive according to the present invention has the advantage tl at the gases developed or formed on the explosion of the same are of noninjurious character, so that it is well adapted for use in blasting both above ground and in mines. Further the explosive according to the present invention has advantage that it may be manufactured at a comparatively low cost.

The explosive according to the present invention consists substantially of a mixture of ammonium nit ate, ferro-silicon or silicon, and nitro-glycerine, gelatinized with nitrocellulose.

i am aware that the explosive composition containing nitrate of ammonia, ferro-silicon and i'ritro-glycerine before known. According to the present invention however gelatinized nitroglycerine is used. I have found that gelatinized nitro-glycerine is much superior to ordinary 1iitroglycerine in the composition of my safety explosive. I ilro-glycerine is a liquid and the composition tends to lump and harden in cartridges and exude during storage. whereas I have found that when gelatinized nitro-glycerine is used not only is the explosive a better explosive but it possesses numerous advantages such as the fact that it does not bake or harden in cartridges and does not exude The. proportions of the r of course, vary within wide liin-ut. of example the following proportions are cited,

50-85 parts by weight of ammonium n1- Applieation filed March 14, 1924. Serial No. 699,317.

trate, l0 parts by weight of ferro-silicon or silicon, 115 parts by weight of gelatinized nitro-glycerine.

By the use of a high proportion of ferro silicon or silicon the explosive will be cheaper owing to the low price of that ma terial. It is advantageous to employ either high-percent ferro-silicon (containing, for example 7595% Si), or else silicon is used. The following are further examples of suitable compositions v (1.) 55 parts by weight of ammonium nitrate, parts by weight of fcrrosilicon or silicon, 10 parts by weight of gelatinized nitroglycerine (containing about 4.0% nitrocellulose).

(2) 7678 parts by weight of ammonium nitrate, 1416 parts by weight of ferrosilicon or silicon, 8 parts by weight of gelatinized nitro-glycerine (containing about 4.0% nitro-cellulose) The process for the manufacture of this explosive is extremely simple. The ammonium nitrate pulverized to a suitable degree of fineness is first mixed or incorporated with nitro-glycerine the likewise finely pulverized ferro-silicon or silicon is thoroughly kneaded or worked into the resulting mixture, whereby a mixture in the form of a somewhat plastic powder is obtained.

It will be understood that the term silicon used in the claims is intended to cover and include any substance containing a large percent of available silicon, such as a ferro-silicon of the kind mentioned above.

Having thus described my invention I declare that what I claim is 1. An explosive, consisting substantially of a mixture of ammonium nitrate, silicon, and nitro-glycerine, the latter being gelatinized by nitro-cellulose.

An explosive consisting substantially of -85 parts by Weight of ammonium nitrate, 10l0 parts by weight of silicon. and 145 parts by weight of nitro-glycerine gelatinized with nitro-cellulose.

S. An explosive consisting substantially of parts by weight of ammonium nitrate, 35 parts by weight. of silicon, and 10 parts by weight of gelatinized nitro-glycerine containing about 4.0% nitrocellulose.

In testimony whereof I affix my signature.

NILS ALFRED UNGER. 

